Volume 6, Book 60, Number 363:
Narrated Al-Bara:
While a man from the companions of the Prophet was reciting (Quran) and his horse was tied in
the house, the horse got startled and started jumping. The man came out, looked around but could
not find anything, yet the horse went on jumping. The next morning he mentioned that to the
Prophet.
The Prophet said, “That was the tranquility (calmness) which descended because of the recitation
of the Quran.”